Calling API based on the returned response

So I am trying a challenge that I got a month ago:
http://challenge.com/challenges?nickname=anythinghere 
I first need to make a post request at this endpoint in order to receive an ID
this is the res structure
id: 'fSkslN++h0BGxtMwlS/OB+OZW+NaIfLqP7dpM0+Zj+WNipwKJMSJJO2wAq4JI5Zs',
  actives_at: 1700583237548,
  called_at: 1700583236759,
  total_diff: 0

2) I then need to use the ID by passing it inside the header as "X-Challenge-Id": {passing the id I got as a response here} on this endpoint
http://challenge.com/challenges?nickname=anythinghere


the method is set to PUT this time and send a request to this endpoint at the scheduled invocation time.
3)Then I need to make the calls again and again till total_diff here reaches more than 500ms
4) upon performing this all correctly the res given is changed to something like this
{
   "result": {
     "attempts": 100,
     "url": "/xxxxxxxx"
   }
}



now I am confused since in my case after I pass in the id as a header and then call the endpoint it is only able to make the call 2 or 1 times which results in the challenge failing and the URL being returned as undefined however, My friend was able to make then 2000 calls? can someone help?
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